5) Which of the factors below weaken the hypothesis of abiotic synthesis of organic monomers in early Earth's atmosphere? 1. the relatively short time between intense meteor bombardment and appearance of the first life forms 2. the lack of experimental evidence that organic monomers can form by abiotic synthesis 3. uncertainty about which gases comprised early Earth's atmosphere A) 1 B) 2 C) 3 D) 1 and 3 E) 2 and 3 Answer: D Topic: Concept 26.1 Skill: Comprehension 6) The early atmosphere of Earth probably retained all of the following molecules in substantial amounts except A) H 2 . B) CH 4 . C) CO 2. D) N 2. E) H 2 O. Answer: A Topic: Concept 26.1 Skill: Knowledge 7) Which of the following has not yet been synthesized in laboratory experiments studying the origin of life? A) liposomes B) liposomes with selectively permeable membranes C) oligopeptides and other oligomers D) protobionts that use DNA to program protein synthesis E) amino acids Answer: D Topic: Concept 26.1 Skill: Comprehension 8) In what way were conditions on Earth more than 2 billion years ago different from those on Earth today? A) The early Earth had water vapor in its atmosphere. B) The early Earth was intensely bombarded by large space debris. C) The early Earth had an oxidizing atmosphere. D) Less ultraviolet radiation penetrated the early atmosphere. E) The early atmosphere had significant quantities of ozone. Answer: B Topic: Concept 26.1 Skill: Knowledge 2

9) What condition would have made the primitive atmosphere of Earth more conducive to the origin of life than the present one? The primitive atmosphere A) had a layer of ozone that shielded the first fragile cells. B) removed electrons that impeded the formation of protobionts.

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